Problem In Executing Child Packages In SSIS (Invalid Access To Memory Location. . )

I have installed Office 2007 Beta 2 and SQL Server 2005 at my system.

I made 2 packages (C:Package.dtsx, C:Package1.dtsx). I am executing Package1 inside Package.dtsx using Executing Package Task.

In package1.dtsx there is some configuration that is coming at runtime(For each loop container having some file connections) , so I have put DelayValidation property of this package to True, but that did not work when I called this package from Package1.dtsx, then I found one workaround, I changed the ExecuteOutOfProcess of ExecutePacakge task to True,

Now the problem is that before installing Office 2007 the both were executing fine (it was taking some time in starting the second package because of OutOfProcess execution).

After installing Office 2007 I get the following error while executing the second package from first package.

Error: Error 0x800703E6 while loading package file "C:Package1.dtsx". Invalid access to memory location. .

This problem comes whenever the I execute the package having OutOfProcess property to true.

Is there any workaround for this, or I am wrong somewhere.

Thanks in advance.

Atul